Hello !!!... I am new to this great forum. I need your help

1998 CHEVROLET BLAZER
110,688 MILES
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ANDY'S TEAM
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Hello !!!... I am new to this great forum. I need your help. I live in Venezuela and I have a 1998 Blazer, 4.3 Vortec engine VIN "W" LS.

The truck starts in the morning and the board (gauge) shows a load above normal for the battery meter. Then the truck fails when:

1 .- At 45 minutes (approx.) has been on, or having covered 20 km.
2 .- If you operate the brake pedal "many times", without crossing streets.
3 .- If descends a hill and stops immediately
4 .- When you turn the A / C
5 .- When using turn signals

THE TRUCK STARTS "random misfire"

I performed the following work:
1 .- Cleaning injectors, "No Change"
2 .- Change spark plugs and wires
3 .- Change alternator
4 .- Change coil and ignition module
5 .- Change distributor cap and rotor
6 .- Change thermostatic
7 .- Change fuel pump
8 .- Change Position Sensor Throttle (TP)
9 .- Replacing the sensor idle air control (IAC)
10 .- Check the ground wires
11 .- Change of battery

What might be happening?

note: THE AIR CONDITIONING WAS INOPERATIVE
Oct 11, 2011 at 5:19 PM
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JACOBANDNICKOLAS
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Is the alternator gauge below 12 volts?
Oct 11, 2011 at 5:25 PM
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ANDY'S TEAM
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Hello!
Thank you for your quick response.
The alternator brand a little over 12 volts. 12.3 approx.
Sorry for my English. This is not so good.
Oct 11, 2011 at 8:57 PM
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JACOBANDNICKOLAS
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The alternator should be putting out around 14+ volts with the engine running. Check the fuseable link between the alt and the battery.
Oct 12, 2011 at 12:23 AM